Optical lens

Abstract

The invention provides an optical lens that can provide small-sized imaging modules. The optical lens of the invention comprises a thermoplastic resin having a refractive index (nD) and Abbe number (ν) satisfying the following mathematical formula (A): nD ≤−0.02×ν+2.040  (A) (where 1.660<nD).

The invention claimed is: 
     
       1. An optical lens comprising a thermoplastic resin, wherein the thermoplastic resin contains a repeating unit represented by the following formula (1): 
       
         
           
           
               
               
           
         
         wherein rings Z represent the same or different aromatic hydrocarbon rings, R 1  and R 2  each independently represent a hydrogen atom, a halogen atom or a hydrocarbon group of 1 to 12 carbon atoms optionally containing an aromatic group, Ar 1  and Ar 2  each represent an aromatic group optionally containing a substituent, L 1  and L 2  each independently represent a divalent linking group, j and k each independently represent an integer of 0 or greater, m and n each independently represent 0 or 1, and W is at least one group selected from groups represented by the following formula (2) or (3), 
       
       
         
           
           
               
               
           
         
         wherein X represents a divalent linking group, 
         wherein the thermoplastic resin has a b* value according to the CIE1976 (L*a*b*) color system of 10.0 or lower, as measured using a 13 mass % solution in methylene chloride (a solution of 1.0 g dissolved in 5 ml of methylene chloride), and has a refractive index (nD) and Abbe number (ν) satisfying the following mathematical formula (A):
     nD≤− 0.02×ν+2.040  (A)
 
 
         (where 1.660<nD). 
       
     
     
       2. The optical lens according to  claim 1 , wherein the thermoplastic resin has a refractive index (nD) and Abbe number (ν) satisfying the following mathematical formula (B):
     nD≥− 0.02×ν+1.960  (B)
 
 
     
     
       3. The optical lens according to  claim 1 , wherein a specific viscosity of the thermoplastic resin is 0.12 to 0.40. 
     
     
       4. The optical lens according to  claim 1 , wherein the glass transition temperature of the thermoplastic resin is 130 to 170° C. 
     
     
       5. The optical lens according to  claim 1 , wherein the thermoplastic resin is a polyester, polyester carbonate or polycarbonate. 
     
     
       6. The optical lens according to  claim 1 , wherein the amount of residual palladium in the thermoplastic resin is 10 ppm or lower.